{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The effects of substituting l - deoxynucleotide for d - deoxynucleotide at duplex termini were evaluated and the terminal substitutions were found to show much less effects on duplex destabilization and to show a similar tendency in base pairing selectivity , compared with internal chiral substitutions ."}
{"Chemical": ["l - deoxynucleotide", "d - deoxynucleotide"]}